着
zhe
Aspect particle "zhe"
着 marks a state that persists — something staying in a condition, rather than an event.
Verb + 着
How it works
门开着 — the door is (standing) open. 我读，你听着 — I'll read, you keep listening.
The contrast with 在 is progressive versus continuous: 他在穿衣服 is he's putting clothes on, 他穿着一件红衣服 is he's wearing a red top.
着 also joins two verbs to say one happens while the other continues: 他站着说话 — he talks standing up.
Examples
mén kāi zhe
门开着。
The door is open.
tā chuān zhe yí jiàn hóng sè de yī fu
他穿着一件红色的衣服。
He's wearing a red top.
tā zhàn zhe shuō huà
他站着说话。
He talks standing up.